An acetic anhydride pyridine mixture acetylates hydroxyl groups in tissue sections. The acetyl groups can be removed from tissue sections by weak alkali. Sections acetylated by acetic anhydride pyridine no longer produce aldehydes after oxidation by periodic acid. Acetylated sections subjected to weak alkali regain the ability to produce aldehydes after oxidation by periodic acid. Acetylation o...

The title compound, C17H13ClO6, is an asymmetric alicyclic dianhydride containing a chloro-methyl-substituted tetra-hydro-naphthalene moiety. The cyclo-hexene ring in the tetra-hydro-naphthalene moiety exhibits an envelope conformation with the tertiary C atom as the flap The dihedral angle between the two anhydride rings is 79.96 (6)°, while those between the benzene ring and the non-fused and...

This communication deals principally with the development of a method for the quantitative fluorometric measurement of the natural estrogens and introduces data on a similar test method for the quantitative determination of cholesterol. To achieve this goal, use has been made of the condensat.ion reaction of phenolic steroids with phthalic anhydride (1, 2). In view of the wide-spread interest i...

A Zn-salen-modified cavitand templates the catalytic formation of acetylcholine from choline and acetic anhydride.

Unsaturated vegetable oils with conjugated carbon–carbon double bonds, such as tung oil, can undergo free-radical polymerization, originating alternatives to petroleum-based materials. The introduction of fillers oil-based polymer matrices results in composites improved mechanical properties. In this work, thermosets were synthesized by the polymerization a mixture divinylbenzene, and n-butyl m...

The asymmetric unit of the title compound, C(23)H(12)O(4), contains two nearly parallel independent mol-ecules; the dihedral angles between the phenanthrene ring systems of the two mol-ecules and between the benzene rings of the two mol-ecules are 4.97 (9) and 8.1 (2)°, respectively. In each mol-ecule, the benzene ring is nearly perpendicular to the phenanthrene ring system, with dihedral angle...

in this research, the selective oxidation of benzene to maleic anhydride (man) in a fixed-bed reactor was studied. the gas phase catalytic oxidation of benzene was carried outin a laboratory scale fixed bed reactor on the catalysts, which were prepared having two different compositions on silica gel. the effects of temperature, flow rates of benzene and air, and catalyst type on the reaction se...